Evaluation And Application For Pavement Energy Consumption Using The Life Cycle Assessment Methodology

In recent years, the rapid development of China’s road construction, roadconstruction, but in the time of rapid development of freeway construction, ourenvironment has endured enormous pressure; energy consumption, large emissions ofgreenhouse gas, no doubt give warning to the current road development of blindpursuit of operational efficiency while ignoring the ecological environment. Energyconservation, green development, is the age requirement for freeway sustainabledevelopment in today’s society.This paper introduces ‘life cycle’ concept, which was applied to evaluate theenergy consumption of road, dividing into four road construction stages: materialsmaterialized stage, the construction stage, the operation and maintenance phase andthe end of life stage. In life cycle assessment method, firstly, model was built andscoping was defined; secondly, energy inventory data, inventory and other buildingmaterials were calculated in accordance with ISO14040and Chinese automobileexhaust emission standards and other specifications. To strengthen the comparativeanalysis of different structures of different pavement energy consumption, this articleestablished three pavement structure models: asphalt pavement, concrete andcement-based composite structural concrete road pavement material. Energyconsumption and carbon emission values of three pavement structures werecalculated in the four stages individually, which not only own compared all theaspects of each pavement structure, and compared the energy consumption ofdifferent pavement structure in the same level.Three pavement structure in terms of energy consumption, the highest value oftotal energy consumption of cement concrete pavement (28754043MJ), the lowestpavement structure of cement-based composites (10590705MJ), the centered energyconsumption values of asphalt pavement construction (14257515MJ). the energyconsumption in the three pavement structure in the material and physical stageoccupied48%、52%and51%respectively of the total。In order to reduce energy consumption, on the premise of ensuring the carrying capacity of the structure of, thesurface layer thickness can be reduced, the use of emulsified asphalt NSP cementproduction and other ways can be used to reduce energy input.In the On maintenance phase, three pavement structures developed into twoconservation programs: overhaul and preventive maintenance. Analyzed perspectively,two values of energy conservation maintenance show that regardless of the pavementstructure, the energy consumption in preventive maintenance is less than that inoverhaul of the energy value. Combined with the actual research Projects Highway325conservation and conservation Wenxian purple yellow lines, two roads weretaken to three years of preventive maintenance and ten years of overhaul program,and in the valid road life cycle, the energy consumption values were150045.05MJand9,843,703.14MJ--60times in difference--not only prove the accuracy of thetheoretical model assumptions, and also shows the roads taking preventivemaintenance can effectively reduce energy consumption.Assessment of road life cycle is extremely complex work, which contains up to600,000items of data, to simplify the calculation of the energy consumption ofdifferent types of road, with the reference of domestic LCA evaluation softwares,eBlance, Gabi, Moves, SimaPro, etc., evaluation software for the life cycle of Chineseroads were designed specifically. The software is just the initial development, andfurther upgrade is needed.